-72 < nl. I HUM' 1 . 



6. Internasals fused with prsefrontals. (A. variegatum, Gthr.) 



o. Yg. (V. 160 ; C. 37). Mexico. M. SalU [C.]. I 



d. $ (V. 149 ; C. 86). Mexico. I 



(Types of A. variegatum.) 



e. Hgr. $ (V. 142; C. 35). Mexico. 



2. Ficimia cana. 



Gyalopion canum, Cope, Proc. Ac. Philad. 1860, p. 243; Yarrow, 

 Wheeler's Rep. U.S. Erplor. Surv. W. IWth Mer. v. p. 624, 

 pi. xviii. fig. 2 (1876). 



Ficimia cana, Garm. N. Am. Kept. p. 83 (1883); Giinth. Siol. 

 C.-Am., Kept. p. 99 (1893). 



Closely allied to the preceding, but rostral pointed behind and 

 wedged in between the prsefrontals ; internasals present, small ; 

 seven upper labials, as in the preceding. Ventrals 130-131 ; sub- 

 caudals 28. Pale yellowish or reddish brown above, with brown, 

 dark-edged cross bars, which are broken up into spots on the sides ; 

 a large triangular dark spot on the nape, with the point between the 

 parietals ; a dark band across the head, to the lower labials, passing 

 through the eyes across the interocular region ; lower parts uniform 

 white. 



Total length 205 millira. ; tail 28. 



Arizona and Western Texas. 



a. (V. 131 ; C. 28). El Paso, Texas. Hr. A. Forrer [C.]. 



3. Ficimia quadrangularis. 



Ficimia quadrangularis, Giinth. Siol. C.-Am., Kept. p. 99, pi. xxxv. 

 fig. A (1893). 



Scaling as in F. cana, but seventh upper labial very small, scale- 

 like. Ventrals 129 ; subcaudals 23. Ground-colour nearly white, 

 each scale with a narrow brown margin ; a series of large sub- 

 quadrangular blackish-brown spots along the back ; no spots on the 

 sides ; a large blackish band on the nape, confluent with a large 

 blackish blotch covering the frontal and supraocular shields and 

 the greater part of the parietals ; lower parts white. 



Total length 320 millim. ; tail 37. 



Western Mexico. 



a. (V. 129 ; C. 23). Presidio, near Mazatlan. Hr. A. Forrer [C.]. 



(Type.) 



101. CHILOMENISCUS. 



Chilomeniscus, Cope, Proc. Ac. Philad. 1860, p. 339, and 1861, p. 302, 

 and Proc. U.S. Xat. Mm. xiv. 1892, p. 593. 



Maxillary teeth equal or the posterior a little stouter. Head not 

 distinct from neck ; snout rounded, very prominent, and much 

 depressed ; eye small, with round pupil ; rostral large ; no loreal ; 



